Across
- 2. older rocks are on the bottom
- 5. youngest event cuts through others
- 6. older or younger
- 8. death of a species
- 11. damage at surface from impact
- 13. position rock layer forms
- 14. name of moon prior to earth impact
- 15. unit of time used to measure age
- 17. theory that describes earth forming
- 18. study of rocks
Down
- 1. exact age of fossil
- 3. organism preserved in rock
- 4. atoms
- 7. the present is the key to the past
- 9. same element just a lil heavier
- 10. space rocks
- 12. process giving off energy
- 16. breakdown